Question

我有一个GridView，显示来自手机的所有图像。我可以选择多个图像并将所选图像保存到arraylist。我想将所选图像的大小限制为1MB。为此，我想在选择时检查每个图像的大小。如果点击图像的大小小于1MB，则会被选中，否则不会。有没有办法做到这一点？

活动

public class CustomGalleryActivity extends AppCompatActivity implements View.OnClickListener {
    private static Button selectImages;
    private static GridView galleryImagesGridView;
    private static ArrayList<String> galleryImageUrls;
    private static GridViewAdapter imagesAdapter;
    int file_size;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.customgallery_activity);
        initViews();
        setListeners();
        fetchGalleryImages();
        setUpGridView();
    }

    //Init all views
    private void initViews() {
        selectImages = (Button) findViewById(R.id.selectImagesBtn);
        galleryImagesGridView = (GridView) findViewById(R.id.galleryImagesGridView);

    }

    //fetch all images from gallery
    private void fetchGalleryImages() {
        final String[] columns = {MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID};//get all columns of type images
        final String orderBy = MediaStore.Images.Media.DATE_TAKEN;//order data by date
        Cursor imagecursor = managedQuery(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null,
                null, orderBy + " DESC");//get all data in Cursor by sorting in DESC order

        galleryImageUrls = new ArrayList<String>();//Init array


        //Loop to cursor count
        for (int i = 0; i < imagecursor.getCount(); i++) {
            imagecursor.moveToPosition(i);
            int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);//get column index

            galleryImageUrls.add(imagecursor.getString(dataColumnIndex));//get Image from column index
            System.out.println("Array path" + galleryImageUrls.get(i));


        }


    }

    //Set Up GridView method
    private void setUpGridView() {
        imagesAdapter = new GridViewAdapter(CustomGalleryActivity.this, galleryImageUrls);
        galleryImagesGridView.setAdapter(imagesAdapter);
    }

    //Set Listeners method
    private void setListeners() {
        selectImages.setOnClickListener(this);
    }


    //Show hide select button if images are selected or deselected
    public void showSelectButton() {
        ArrayList<String> selectedItems = imagesAdapter.getCheckedItems();
        if (selectedItems.size() > 0) {
            selectImages.setText(selectedItems.size() + " - Images Selected");
            selectImages.setVisibility(View.VISIBLE);
        } else
            selectImages.setVisibility(View.GONE);

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.selectImagesBtn:

                //When button is clicked then fill array with selected images
                ArrayList<String> selectedItems = imagesAdapter.getCheckedItems();

                //Send back result to MainActivity with selected images
                Intent intent = new Intent();
                intent.putExtra(UploadActivity.CustomGalleryIntentKey, selectedItems.toString());//Convert Array into string to pass data
                setResult(RESULT_OK, intent);//Set result OK
                finish();//finish activity
                break;

        }

    }
}

public class GridViewAdapter extends BaseAdapter {
    private Context context;
    private ArrayList<String> imageUrls;
    private SparseBooleanArray mSparseBooleanArray;

    public GridViewAdapter(Context context, ArrayList<String> imageUrls) {
        this.context = context;
        this.imageUrls = imageUrls;
        mSparseBooleanArray = new SparseBooleanArray();
    }

    //Method to return selected Images
    public ArrayList<String> getCheckedItems() {
        ArrayList<String> mTempArry = new ArrayList<String>();

        for (int i = 0; i < imageUrls.size(); i++) {
            if (mSparseBooleanArray.get(i)) {
                mTempArry.add(imageUrls.get(i));
            }
        }

        return mTempArry;
    }

    @Override
    public int getCount() {
        return imageUrls.size();
        //return 10;
    }

    @Override
    public Object getItem(int i) {
        return imageUrls.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int position, View view, ViewGroup viewGroup) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (view == null)
            view = inflater.inflate(R.layout.customgridview_item, viewGroup, false);//Inflate layout

        CheckBox mCheckBox = (CheckBox) view.findViewById(R.id.selectCheckBox);
        final ImageView imageView = (ImageView) view.findViewById(R.id.galleryImageView);




        Picasso.with(context).load("file://" + imageUrls.get(position)).placeholder(R.drawable.placeholder).into(imageView);

        mCheckBox.setTag(position);//Set Tag for CheckBox
        mCheckBox.setChecked(mSparseBooleanArray.get(position));
        mCheckBox.setOnCheckedChangeListener(mCheckedChangeListener);
        return view;
    }

    CompoundButton.OnCheckedChangeListener mCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            System.out.println("sammy_position "+buttonView.getTag());

            
			File f = new File(imageUrls.get((Integer) buttonView.getTag()));
            int file_size = Integer.parseInt(String.valueOf(f.length() / (1024*1024)));

            // Filtering the image size
            if(file_size<1){
                mSparseBooleanArray.put((Integer) buttonView.getTag(), isChecked);//Insert selected checkbox value inside boolean array
                ((CustomGalleryActivity) context).showSelectButton();//call custom gallery activity method
            }else{
                buttonView.setChecked(false);
                Toast.makeText(context, "Select image of size 1MB or less", Toast.LENGTH_SHORT).show();
            }


        }
    };
}

Answer 1

 public void calculateImageSize(int imageId){
        Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
                imageId);


        Bitmap bitmap = bitmapOrg;
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
        byte[] imageInByte = stream.toByteArray();
        long lengthbmp = imageInByte.length;

        double sizeInKB=(lengthbmp/1024);
        double sizeInMB=(lengthbmp/(1024*1024));

        Log.d("TAG","Size  "+sizeInKB+"KB");
        Log.d("TAG","Size  "+sizeInMB+"MB");

    }

用此替换适配器

import android.content.Context;
import android.util.SparseBooleanArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;

import java.util.ArrayList;

public class GridViewAdapter extends BaseAdapter {
    private Context context;
    private ArrayList<String> imageUrls;
    private SparseBooleanArray mSparseBooleanArray;
    private boolean isCustomGalleryActivity;

    public GridViewAdapter(Context context, ArrayList<String> imageUrls, boolean isCustomGalleryActivity) {
        this.context = context;
        this.imageUrls = imageUrls;
        this.isCustomGalleryActivity = isCustomGalleryActivity;
        mSparseBooleanArray = new SparseBooleanArray();
    }

    //Method to return selected Images
    public ArrayList<String> getCheckedItems() {
        ArrayList<String> mTempArry = new ArrayList<String>();

        for (int i = 0; i < imageUrls.size(); i++) {
            if (mSparseBooleanArray.get(i)) {
                mTempArry.add(imageUrls.get(i));
            }
        }

        return mTempArry;
    }

    @Override
    public int getCount() {
        return imageUrls.size();
        //return 10;
    }

    @Override
    public Object getItem(int i) {
        return imageUrls.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int position, View view, ViewGroup viewGroup) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (view == null)
            view = inflater.inflate(R.layout.customgridview_item, viewGroup, false);//Inflate layout

        CheckBox mCheckBox = (CheckBox) view.findViewById(R.id.selectCheckBox);
        final ImageView imageView = (ImageView) view.findViewById(R.id.galleryImageView);

        //If Context is MainActivity then hide checkbox
        if (!isCustomGalleryActivity)
            mCheckBox.setVisibility(View.GONE);

        Picasso.with(context).load("file://" + imageUrls.get(position)).placeholder(R.drawable.placeholder).into(imageView);

        mCheckBox.setTag("file://" + imageUrls.get(position));
        mCheckBox.setId(position);//Set Tag for CheckBox
        mCheckBox.setChecked(mSparseBooleanArray.get(position));
        mCheckBox.setOnCheckedChangeListener(mCheckedChangeListener);
        return view;
    }

    CompoundButton.OnCheckedChangeListener mCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            mSparseBooleanArray.put((Integer) buttonView.getId(), isChecked);//Insert selected checkbox value inside boolean array

            String imagePath = (String) buttonView.getTag();
            ((CustomGalleryActivity) context).showSelectButton();//call custom gallery activity method
        }
    };
}

使用此功能查找kb＆amp;的大小MB

选中复选框上的图像大小

1 个答案: